You must tunnel the traffic first time for find your server, you wont need to tunnel it more then really first time when you want to discover the server.
ssh -L 32400:localhost:32400 email@example.com
Once tunnel is established go setup your browser to use localhost:32400 in network settings, now just browse to: https://localhost:32400/web
You will now be able to browse your server from anywhere, anytime. Just visit: http://plex.tv/web/index.html#
The only port that is required to be open in itpables is port 32400 of course.